A good quality build, which is solidly constructed. There are LEDs to show power and when each relay is switch on. It has a nice 'click' when the relays toggle. It works out of the box with arduino nano and other devices I'm sure. You can connect to outputs Normally Open or use the other slot for Normally Closed Quite a weighty board, so not ideal for ... Read more
Economical price, small board size (72x49mm), 230VAC-capable relays with switchover contacts (so can do botu NO and NC). Tested with Raspberry Pi and its LVTTL (3.3V) output can drive the relay input high; in this state the board consumes 3.7mA of current from RPi output which is quite safe. Naturally should work fine with Arduino and other 5V TTL devices.... Read more
This relay has an easy and understandable layout. It activates the relays on "high trigger", which I find useful for my applications. This module has male headers. If you combine this module with an Arduino, female headers would've been more handy. I wish I had bought the 8 Channel version instead of the 4 Channel. I'm using this one for 1... Read more
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